检索结果-南通市图书馆

Effects of calendering state on coupled electrochemical-mechanical performance of silicon based composite electrodes

引用

Green Energy and Intelligent Transportation 2024年第5期3卷 34-41页

作者： Dawei Li hongfei wan Jiahui Liu Hainan Jiang Yikai wang Junqian Zhang Yuejiu Zheng School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Engineering Physics Tsinghua UniversityBeijing100084China Department of Chemical and Materials Engineering University of KentuckyLexingtonKY 40506USA Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China

The super volume changes and severe mechanical degradation have been a hindrance in the wide application of silicon based composite electrodes in commercial lithium-ion batteries(LIBs).Calendering,one procedure in producing LIBs'electrodes,is indispensable to ensure low porosity and energy ***,the repercussions of the calendering process on the physical characteristics related to the behavior of silicon(Si)based electrodes during the electrochemical reaction have not been well ***,on account of the deformation characteristic of cantilever electrodes,an in-situ technique is employed to analyze the repercussions of calendering status on the coupled electro-chemo-mechanical *** the electrochemical cycling,Young's modulus and diffusion-induced stress in composite electrodes are *** results show that the swelling strain,the stress and the modulus of the Si-based electrode and the calendering degree are positively ***,the stress induced by diffusion in the active layer tends to increase in the stage of lithiation and reverses during the delithiation *** with the SEM analysis,we conclude that the calendering process can induce larger stress,driving the formation of cracks in *** findings can help understand how the calendering process could affect the capacity dissipating and lifetime of Si based electrodes.

关键词： Calendering degree In situ measurement Coupled electro-mechan-chemical properties Si composite electrode Stress evolution

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Recent advances and trends of single-atom catalysts for proton exchange membrane fuel cell cathodes

ChemPhysMater

引用

ChemPhysMater 2024年第2期3卷 143-156页

作者： Zihao wan Feng Liu hongfei Xu Shuaili Zhao Zhen An Zizai Ma Zhonghua Zhang Yun Wu Xiaoguang wang Laboratory of Advanced Materials and Energy Electrochemistry Institute of New Carbon MaterialsCollege of Material Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China Datong Innoreagen Power Technology Co. LtdDatong 037000China College of Chemistry Taiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan250061China Department of Materials Science and Engineering Guangdong University of Petrochemical TechnologyMaoming 525000China

Proton exchange membrane fuel cells(PEMFCs),which have the advantages of high-power density,zero emission,and low noise,are considered ideal electrochemical conversion systems for converting hydrogen(H2)and oxy-gen(O_(2))/air into ***,the oxygen reduction reaction(ORR),which is accompanied by multiple electrons,results in voltage loss and low conversion efficiency of ***,PEMFCs mainly use high-load precious platinum(Pt)to promote the ORR process;however,the high cost of Pt hinders the widespread commercialization of *** the past few years,metal-nitrogen-carbon single-atom catalysts(M-N-C SACs)have attracted considerable attention and have been recognized as potential Pt-based catalysts owing to their outstanding ORR *** review briefly introduces the components of ***,we discuss the catalytic mechanisms of the M-N-C SACs for the ***,the latest advances in noble,non-noble,and heteroatom-doped M-N-C SACs used as ORR and PEMFCs cathode catalysts are systematically *** sum-mary,we have outlined the current challenges and proposed a future perspective of M-N-C SACs for PEMFCs cathodes.

关键词： Proton exchange membrane fuel cells Oxygen reductionreaction Cathode Platinum-based catalysts Metal-nitrogen-carbon single-atom catalysts

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

金属丝编制网试验筛筛孔尺寸测量值的不确定度评定及影响因素分析

引用

计量与测试技术 2014年第10期41卷 59-60页

作者：万鸿飞新疆维吾尔自治区计量测试研究院新疆乌鲁木齐830011

本文介绍了使用影像测量仪测量金属丝编织网试验筛筛孔尺寸时,影响试验筛筛孔尺寸测量结果不确定度的因素。

关键词：试验筛影像测量仪不确定度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

在重度阻塞性睡眠呼吸暂停综合征患者中伴随睡眠磨牙的阻塞性睡眠呼吸暂停事件相关的心率变化

引用

世界复合医学 2021年第12期7卷 79-82页

作者：万宏飞江西省精神病院精神科江西南昌330029

目的该研究试图对重度阻塞性睡眠呼吸暂停(obstructive sleep apnea,OSA)患者伴随或不伴随睡眠磨牙(sleep bruxism,SB)的OSA事件相关的心率变化进行研究。方法该研究对2020年5月—2021年2月在江西省精神病院进行多导睡眠监测的9例重度OS... 详细信息

目的该研究试图对重度阻塞性睡眠呼吸暂停(obstructive sleep apnea,OSA)患者伴随或不伴随睡眠磨牙(sleep bruxism,SB)的OSA事件相关的心率变化进行研究。方法该研究对2020年5月—2021年2月在江西省精神病院进行多导睡眠监测的9例重度OSA患者在伴随或不伴随SB的OSA事件的事件期间和呼吸暂停恢复期的心率最小值、最大值和平均值的变化进行分析。结果72.0%的SB事件在OSA事件后的呼吸恢复期开始前2 s内开始,80.7%的SB事件在OSA事件后的呼吸恢复期结束前结束。OSA恢复期心率的最小值、最大值和平均值都比OSA期间的心率的最小值、最大值和平均值更高,差异有统计学意义(P<0.001)。而且,伴随SB的OSA事件相关心率的最大值和平均值都比不伴随SB的OSA事件相关心率的最大值和平均值更高,差异有统计学意义(P<0.001)。结论大部分的SB事件发生在OSA恢复期间。伴随SB的OSA患者可能比不伴随SB的OSA患者具有更高的患心血管疾病的风险。

关键词：阻塞性睡眠呼吸暂停心率睡眠磨牙

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rb(5D-7S)-He,Ar,H_2的碰撞能量转移

引用

中国激光 2009年第8期36卷 2009-2013页

作者：张岩文万鸿飞崔秀花戴康吕磊王睿沈异凡新疆大学物理科学与技术学院新疆乌鲁木齐830046 石河子大学师院物理系新疆石河子832000

在样品池条件下,利用原子荧光光谱方法,测量了Rb(5D)-He,Ar,H_2碰撞中5D→7S的激发能量转移截面。获得的荧光包括由激发态产生的直接荧光部分和由于碰撞布居态而产生的敏化荧光部分。在不同的猝灭气体压强下,测量丁相关的两部分荧光的... 详细信息

在样品池条件下,利用原子荧光光谱方法,测量了Rb(5D)-He,Ar,H_2碰撞中5D→7S的激发能量转移截面。获得的荧光包括由激发态产生的直接荧光部分和由于碰撞布居态而产生的敏化荧光部分。在不同的猝灭气体压强下,测量丁相关的两部分荧光的相对荧光强度,得到了Rb(5D)与He,Ar和H_2碰撞的5D→7S转移截面分别为(1.2±0.3)×10^(-17)cm^2,(1.3±0.3)×10^(-18)cm^2和(8.3±2.1)×10^(-17)cm^2。同时确定了Rb(7S)与He,Ar和H_2的碰撞猝灭速率系数。7S态与H_2的碰撞猝灭速率系数1.7×10^(-10)cm^3·s^(-1)比Rb(7S)与He,Ar的大得多,它是反应与非反应速率系数之和,利用实验数据确定Rb(75)与H_2的反应截面为(1.0±0.4)×10^(-16)cm^2,Rb(5D)与H_2反应截面为(7.1±2.9)×10^(-17)cm~。Rb(7S)与H_2的反应活动性大于Rb(5D)。

关键词：激光光谱碰撞能量转移荧光截面 Rb—He Ar H2

来源：

维普期刊数据库

同方期刊数据库评论